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Origin of life

ICSE · Class 12 · Biology

Quick revision notes for Origin of life — ICSE Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

103 questions34 flashcards5 concepts

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Key Topics to Revise

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1. Universe, Earth, and the setting for life

  • Cosmos is believed to have originated 10-20 billion years ago.
  • The Big Bang Theory explains the origin of the universe.
  • There are approximately 100,000 million galaxies.
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2. Early ideas about origin of life

  • Theory of Special Creation says life originated due to a supernatural event.
  • This view is based on faith and is outside the framework of scientific investigation.
  • According to the first chapter of Genesis in the Bible, the world was created within six natural days and human beings were created on the sixth day.
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3. Experimental proof of biogenesis

  • Biogenesis means life comes only from pre-existing life.
  • Francesco Redi used three jars in 1668: uncovered, muslin-covered, and parchment-covered.
  • After a few days, maggots appeared only in the first jar and not in the other two.
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4. Modern biochemical origin of life: Oparin-Haldane theory

  • The first scientific account of the origin of life was given by Aleksander I. Oparin in 1924 and later by J.B.S. Haldane in 1929.
  • The theory is also called the modern theory or abiogenic theory.
  • Oparin published his views in the book The Origin of Life in 1936.

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Full Notes

Key Concepts

The cosmos is believed to haveLife is described as having originatedThis old idea states that lifeBiogenesis states that life arises onlyThis modern theory explains the biochemical

Frequently Asked Questions

What are the important topics in Origin of life for ICSE Class 12 Biology?
Key topics in Origin of life include Timeline of Major Events in Origin of Life, Oparin-Haldane Eight-Step Process of Life's Origin, Mind map showing the hierarchical structure of universe formation from Big Bang through solar system development and planetary conditions.. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Origin of life — ICSE Class 12 Biology?
Understand the core concepts first, then work through the 103 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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